wc_save_vector_registers_x86() and wc_restore_vector_registers_x86() to allow
recursive WC_SVR_FLAG_INHIBIT while already in a vector save context;
linuxkm/lkcapi_sha_glue.c: in get_drbg() and put_drbg(),
DISABLE_VECTOR_REGISTERS()...REENABLE_VECTOR_REGISTERS() if tfm ==
crypto_default_rng.